diff --git a/tox.ini b/tox.ini
index 84389e5..9e6868e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,7 @@ setenv =
    VIRTUAL_ENV={envdir}
    BRANCH_NAME=master
    CLIENT_NAME=python-karborclient
+   PYTHONWARNINGS=default::DeprecationWarning
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py test --slowest --testr-args='{posargs}'